IP e Netmask: l'ip appartiene alla netmask?

[Santino83_02]

Salve,

io ho un ip, una netmask e un'interfaccia di rete col suo ip.. come faccio a capire se l'ip appartiene alla netmask e alla stessa interfaccia? o meglio, come si fa in php a fare l'and bit-a-bit? si può fare con le stringhe?

tipo:

$ip1="192.168.0.1";
$ip2="192.168.1.250";
$netmask="255.255.255.128";
$interface="192.168.0.240";


echo "ip1 = int: ".($ip1 ^ $netmask === $interface ^ $netmask)."
";
echo "ip2 = int: ".($ip2 ^ $netmask === $interface ^ $netmask)."
";

è corretto secondo voi? oggi non ci sto con la testa

[Santino83_02]

vabbeh mi rispondo da solo:

class IpUtility extends Object{
	
	public $interface;
	public $network;
	public $netmask;
	
	private $interface_long;
	private $network_long;
	private $netmask_long;
	private $broadcast_long;
	
	function __construct($interface=null, $netmask=null, $network=null){
		$this->interface=$interface;
		$this->network=$network;
		$this->netmask=$netmask;
	}
	
	//match if ip matchs with network/netmask given
	public function matchIp($ip){
		
		$this->processData();
		
		$ip_long=ip2long($ip);
		
		return (($ip_long & $this->netmask_long) == $this->network_long);
	}
	
	//setup data
	private function processData(){
		
		if(!$this->interface || !$this->netmask)
			throw new Exception('insert interface/netmask');
			
		$this->interface_long=ip2long($this->interface);
		$this->netmask_long=ip2long($this->netmask);
		
		if(!$this->network){
			$this->network_long=($this->interface_long & $this->netmask_long);
		}else{
			$this->network_long=ip2long($this->network);
		}
		
		$this->broadcast_long=$this->network_long | (~$this->netmask_long);
	}
	
	//return an array with network range
	public function getNetRange(){
		
		$this->processData();
		
		
		return array( long2ip($this->network_long + 1) , long2ip($this->broadcast_long - 1));
		
	}
	
	//return broadcast ip
	public function getBroadcast(){
		
		$this->processData();
		
		return long2ip($this->broadcast_long);
	}
	
	//return network ip
	public function getNetwork(){
		
		$this->processData();
		
		$this->network=long2ip($this->network_long);
		
		return $this->network;
	}
	
	//return true if the given range is valid in the network or not
	public function isValidRange($ip1, $ip2){
		
		$this->processData();
		
		$ip1_long=ip2long($ip1);
		$ip2_long=ip2long($ip2);
		
		if($ip1_long>$ip2_long)
			return false;
		
		$valid_range=$this->getNetRange();
		
		if($ip1_long<ip2long($valid_range[0]) || $ip1_long>ip2long($valid_range[1]))
			return false;
		
		if($ip2_long<ip2long($valid_range[0]) || $ip2_long>ip2long($valid_range[1]))
			return false;
			
		//valid range
		return true;
	}
}